hokanson



Jan. 192s. 1,655,186

.0. A. HOKANSON LINE LOCK FOR TYPEWRITERS Filed April 28. 1924 2Shets-Sheet. 1

Y I) Q ii I \T n+1 1 1g '1 r Jive/2107" m a.

Jan. 3, 1928. 1,655,186

0. A. HOKANSON LINE LOOK FOR TYPEWRITERS.

Filed April 28. 1924 "z Sheets-Sheet 2 .Patentecl Jan. 3, 1928.

.UN T STATES PATENTOFFICE' o'r'ro A. nokaivsoiv, or wooDsrocK, ILLINOIS,AssIeNoR r woonsrocir 'rvrnwnirnn COMPANY, or woonsrrocx, ILLINors, ACORPORATION on rumors.

LINE Lock r012. rvrnwnr rnns.

Application filed'April as, 1924. Serial no. 709,328.

This invention relates to means for locking the operating mechanism of atype- I writeragainst movement at a predetermined oint in the travel ofthe carriage, as for instance at the end of the line, and has for itsobject the provision of such a device which shall be of improvedconstruction and operation and which will be applicable to both powerand hand-operated machines.

The invention is exemplified in the combination and arrangement of partsshown in the accompanying drawings and described in the followingspecification, and it is more particularly pointed out in the appendedclaims.

In the drawings:

Figure 1 is asomewhat fragmentary vertical sectional view of atypewriting ma chineshowingone embodiment of the present invention.

Fig. 2 is a horizontalsectional view subs stantially on line 2--2 ofFig.1.

Fig. 3 isayertical sectional view substantially on line 3-3 of Fig. 2.

Fig. 4; is a fragmentary vertical section substantially on line 4-41 ofFig. 3.

The'finventionis illustrated in the drawing asapplied to a Woodstocktypewriting machineslmilar to thatshown in my prior Patent 1,307,051,granted June 17, 1919.

The numeral 10 designates thebase frame of the machine having keylevers11 pivoted at 12 thereon and having a stop bar13secured to the rear ofthe carriage. The bar 13 is provided with adjustable stops 14, one

of which-is arranged to engage a pin15 on alever16*as the carriageapproaches the end of the line. The stop 14may befadjusted to anydesired position on the bar 13.

A link 17 connects the lever 16 with a bell crank 18, the bell crankbeing connected to a link 19 extendingtoward the front of the machine.The link and lever mechanism,

together with the stop bar and stop,are similar to that in my priorpatent referred to above. A power roller 20 may be employed foroperating the type bars, the

mechanism for this purposebeing similarto that of my copendingapplication, Serial so No. 703,927, filed April 3, 1925.

single key lever at one time.

The forwardend of the link 19 is pro vided wlth an upwardly extendingbar or arm 21 having an angular slot 22in its upper end, the slot beingbest shown in Fig. 4. A detent 23 is pivoted at 24 on the frame 10, and18 provided with a spring 25, for

normally rotating it in a counter-clockwise Q direction, as viewed inFig. 1. The detent 23 1s provided with a horizontally extending arm 26,which projects across one or more of the key levers 11 and is bentdownwardly to carry a plate 27 positioned adjacent the lateral face ofone of the levers 11. The rotation of the detent 23 under the influenceacross the frame of the machine to guide the key levers and to provideinterlocking means to prevent operation of more than a single :key leverat one time. The bar 29 carries a series of disks or tumblers 30 held inagroove therein by a plate 31. These disks have sufficient playlongitudinally of the groove to permit depression of but a Thedownwardly depending plate 27 arranged adjacent one of the key levers,as shown more clearly in Fig. 3, will pass between two of the disks 30andso take up the lost motion or play between the disks. When the plate27 is thus depressed, the disks 30 will prevent depressionof any one ofthe key levers, so that the key levers will be locked against operation.Depression of the plate 27 is effected by means of a pin 31 carried byan ear32 formed on the detent 23. The pin 31 normally engages thevertical portion of the slot 22, so that thedetent 23 will be rocked tomove the link 19 forwardly. It will thus be seen that at the end of theline, or at any other desired point in the travel of the carriage, asdetermined bv the position of the stop 11, the key levers will be lockedagainst 27 011 the interlocking disks 30.

movement through the action of the plate It is frequently desirable torelease the line-lock to permit the insertion of one or more letters inthe lineafter the action of the lock. For this purpose a release key ispivoted at 36 to the machine frame, and is provided with a downwardlyextending arm 37, having a laterally bent lug 38 underlying t is link19. A spring 39 connects the lug 38 with a laterally bent lug on the endof the link 19. The spring 39 thus holds therelease key 35- in itsupward position, and at thesame time drawsthelink l9 rearwardly.Depression of the release key 35 will lift the link 19 and the arm21upWardly 1 so as to bring the horizontal portionof the slot 22 inregistration with the pin 31. This Will.permit'thespringi25 to rotate.the detent Q3backwardly and lift theplate 27 out of contact with thedisks 30, thus releasing the lock and permitting further operationof thekey levers. As soon as the carriage ismoved bya key lever operation .toclear the pin 15 fromnthe stop let, the link 19 will move rear- Iwardly, bringing the forward portion of thewhorizontal arinof the slot22intoregistration with the. pin,3l,.so.that the arm 21 cangmovedownwardly bringing thepin 31 and slot 22 into the relation shown inFig. 4, thus permitting the parts to resume their normalrelation. It:will be seen that the form oflock, included in the. present inventionisespeeially useful inconnectio11.with a power-actuated machine, sinceit intercepts the movement of the key levers and prevents actnationnofthe. powerrdrivenrparts. It is I apparent thatitwould beiimpractical toatof key levers, movable tumblers interposed the path of-said key leversand having sufiic'ient clearance for peanitting actuation of a singlekey lever, and line-lock mechanism for taking up the clearance of saidtumblers to. prevent operation of said key levers.

. 3. In a typewriting machine, a plurality of-key levers, a'slotted combfor guiding said key levers, tumblers carried by said comb forpreventingoperation of more than a singleikey' lever at one time, andmeans for locking. said tumblers; against movement at apredeterminedpoint in the line to lock all of said key levers againstoperation.

at. The combination with a plurality of key levers, of interlockingmeans for preventing operation of more than one of said key levers at agiven time, line-lock mechanismior setting said interlocking means inposition to prevent operation 01 said key vevens, and means forreleasing said interloc' ngmeansto permit i'urther operation oi. saidkey levers;

5. in a typewriting machine, a plurality 01' key levers, a plurality oftumblers interposed in the path of said key levers, a movable detent,and line-lock mechanism for moving said detent into and outofengagement-.with said tumblers to cause said tum-w blei-s to locksaidkey levers against operation.

(5. A 'typewriting machine having a plu rality ot key levers, ofinterlocking means for preventing operation oi a. plurality of keylevers at one time, a movable member for setting said interlocking meansfor pre ventingbperation oi all of said key levers, a carriagecontrolled member having a pin and slot conneet-ion with said movableme1nber,.said pin and slot connection beingshii'table to permit releaseof said interlocking means.

'2'. in a typewriting machine having a plurality of key levers,ofinterlocking means for.- preventingyoperation of more than one key ieverat a time, a movable detent for holding said interlocking means inposition tov prevent operation oliallof said key levers, a member foractuating said detent, carriage-controlled means for actuating saidmember, and a release key for relatively moving LStliCl member anddetent to permit release of saiddetent.

8. Ina typewriting.machine, a plurality of keylevers, tumblers arrangedin the path of said key. levers for preventing operation ofmorethanonekey lever at a time, a detent. having locking-device movable intoand out of the path 01' said tumblers to lock said. tumblers in positionto prevent oper tion of. all of said key levers, a carriage-controlleddcvice for moving said detent having a pin and slot connection with saiddetent, and a release key for shifting said pin. and slot connection topermit release of said detentwhen actuated by said carriage controlleddevice.

9. In atypewriter, aplurality of key levers, a slotted comb having aplurality of tumblers arranged in the path of said key levers andmovable relatively to one another to permit operation of a single keylever at .one time, and a line-lock detent positioned admcent one ofsaid key levers and movable into contact with said tumblers to hold saidtumblers against movement and prevent operation of said key levers.

10. In a typewriting machine, a plurality of key levers, movabletumblers for preventment with said tumblers to lock said tumingoperation of more than one key lever at blers and prevent operation ofsaid key a time, and a pivotally mounted detent havlevers. 10 ing ahorizontal extending arm arranged In testimony whereof I have signed m 5above said key levers, said arm carrying a name to this specification onthis 24th day downwardly extending plate adjacent one of April, A. D.1924. a of said key levers and movable into engage- OTTO A. I-IOKANSON.

